Rotary pump



June 5, 192s. "1,672,257

L. F. HElTZ Y ROTARY PUMP Y 2s, 192e 2 Shee S Filed dywb June 5, 1928. 1,672,257

L. F. HEITZ y ROTARY PUMP Filed Aug.2s, 1926 2 sheets-sheet 2 gumnnlmms mmltll-un Patented June 5, 1928.

UNITED STATES 1,612,257 PATENT OFFICE.

LEONARD F. HEITZ, OF LAKE MILLS, WISCONSIN, ASSIG'NOR TO TEE CREAI-BEY PACKAGE MFG. COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION l' ILLINOIS.

ROTARY PUMP.

Application led August 23, 1928. vSerial No. 130,832.

The inventionrelates to rotary pumps, more particularly to that type having a cylindrical casing wherein a concentric toothed rotor and an eccentric toothed idler operatively intermesh at one side of the chamber between the casing suction and discharge ports the opposite space between the dis-engaged teeth eing occupied by a stationary crescent shaped member.

The principal object of the invention is to provide an improved construction in a pump of this type, by which efiicienc and smoothness of operation is promote and which is structurally simple and economical to manufacture.

i Other objects and advantages will be apparent in the following detailed description of a preferred embodiment of my invention which I have illustrated in the accompanying drawings. It will be understood, however, that various changes in form, construction and arrangement may be made by those skilled in the art without departing from the scope and spirit of the invention as expressed in the appended claims.

Referring to the drawings'Fig. 1 is a front elevation of the pump unit. Fig. 2 is a sectional side elevation as seen on the-planes of the broken line 2 2 in Fig. 1, and as further indicated by the similarly broken line angularly positioned in Fig. 3.V Fig. 3 is a cross sectional elevation on the plane of line 3-3 in Fig. 2, and looking toward the front end of the pump. Fig. 4 is a vertical sectional view of the enclosure or cover plate only as seen on the plane of the full line 4 4 in Fig. 3.

In the drawings.` the reference numeral 1 indicates a pump casing. which encloses a cylindrical chamber 2. open at the front end and provided in its cylindrical wall with a pair of ports 3 and 4. from which open respectively the passages 5 and 6 through the nipple extensions 7 and 8 of the casing, the

latter being suitably constructed to receive the conventional union connections for sanitary piping as indicated at 9 and 10.

The ports 3 and et are preferably positioned about ninety degrees apart in the wall 5 of the casing, and either may be used as a suction port and the other a discharge port as desired. and so determined by the direction of rotation of the operative members enclosed in the chamber.

The casing 1 is illustrated herein as being supported upon a bracket 11, shown herein in fractional part, the bracket receiving a rearwardly extended hub portion 12 of the casing 1. The bracket 12 may be attached to or form a part of a motor base or other fixture carrying the means for operating the pump. t

The numeral 13 indicates an o eratin shaft positioned axially of the cyindrica chamber 2 and having its bearing in the rear hub 12 of the casing, the bearing and shaft being provided with a conventional packing gland' structure as indicated at 14,

The shaft 13 extends inwardly of the casing chamber 2 and operatively carries a r0- tor plate 15, removably secured to the shaft by having a sliding bearing on the end of the shaft and being provided with a rearwardly projecting hub 16 extending into a suitable recess in the rear wall of the chamber, the hub being slotted diametrically to receive a driving cross pin 17 mounted in the shaft 13.

The rotor plate 15 is provided with a concentric annular series of laterally or frontally extending spaced teeth 18 which revolve in operative proximity to the cylindrical wall of the chamber, the teeth and intervening spaces passing successively before the ports 3 and 4. l

The open front end of the casing 1 supports an end closure or cover plate 19, having a portion fitting within the end of the cylindrical chamber 2 and carrying a vstub shaft 20 secured in the plate and extending into the chamber. The stub shaft 20 is positioned with its axis parallel to the axis of the drive shaft 13, but in eccentric relation thereto.

The stub shaft 20 carries an idler member 21 mounted within the chamber and resembling a conventional spur gear, the idler being preferably provided with a bearing bushing 22 for rotation on the stub shaft. The teeth of the idler 21 are arranged for intermeshing engagement with the teeth 18 of the driven rotor, the point of full engagement preferably being midway 'between the suction and discharge ports 3 and 4. Opposite the point of full engagement the respective teeth are wholly disengaged and the crescent shaped space between the paths of movement of the idler teeth and rotor teeth is occupied by a crescentic member 23 preferably formed and supported on the cover plate 19. The cover plate 19, with it-s the cover supportedy shaftand member,

is positioned inproper relation to the casing,

preferably by means of a pin 24 fixed in the casing and extending throriglh a suitable locating hole in the cover. e cover may endwardly secured ink position by any suitable means, that herein illustrated being a yoke 25 havin its ends hooked rearwardly of the casin ange 26, and carrying a bearin screw 2 having a hand wheel 28 -b w 'ch it is turned into securing contact wit plate.

The principal feature of my improvement resides in the o erating relation o f the idler and rotor teetli) to the inner face of the cover plate, it being understood, however, that the arrangement about to be described mi ht be eiected in the rear -wall of the casing y a reversal of arts. 3 The rearward face of the idler 21 ars operatively upon the adjacent face of the rotor plate 15,

the teeth of the idler moving into the spaces between the teeth 18 of the rotor as they respectively approach the point of full engagement, an `being withdrawn therefrom as they move away rom that point.

The idler is constructed of a width substantially eaterv than the lon 'tudinal length of tli rotor teeth, so that t e front faces of the idler teeth lie in a plane substantially outward or frontward o the plane of the end faces of the rotor teeth. The adjacent portion of the inner face of the cover plate is in operative bearingcontact with t e front face of the idler, and is extended in the same plane between the ports 3 and 4, thus including the space within the crescentic member 23 and between the two ports. The lane of this portion of the cover plate inner ace is indicated at 29 in Fig. 4.

It will here be obvious that the idler teeth, being in frontward operative contact with the cover plate and rearwardly in contact with the inner face of the driven rotor plate, effect a closure against communication between the ports 3 and 4 when operating in full engagement with the rotor teeth in the space between the two ports. At the same time there is a substantial space between the ends of the rotor teeth and the ad'acent face of the cover plate while passing before and between the ports, as shown at 30 in Fig. 2. This clearance revents the locking of liquid betweeen t e respective teeth of the idler and rotor as they move into full engagement, which otherwise occasions much noise and loss of efficiency in operation. This clearance of the rotor teeth also provides added facility for the entry of the liquid into the spaces between the teeth of the rotor and the idler as they are withdrawn from engagement before the suction port, and also for the discharge of the liquid as they move into engagement before the discharge port.

v The clearancel described is taken up through that portion of the path of movement ofthe rotor teeth which is not initrsected by' the path of movement of-the` iler teeth, so that slippage oftheiliquid *about the disengaged rotor teeth with consequentuloss of eiciency is prevented. This is accomplished by extending inwardly the face of the cover plate adjacent to the isengaged ath of the rotor teeth, so that that portion ofptheface is inoperative bearing contact with the adjacent end faces of the rotor teeth. This inwardly extended surface, indicated at 31 in Fig. 4, extends outwardly of the crescentic member2 and perferably ends at the outer limits of the port openings with the shoulders illustrated at 32 and 33.'

It will thus be seen that, 'while the rotor teeth are travelling between the lsuction port and the discharge ort, there is no clearance between their endp faces and the adjacent face of the end closure plate, and that while travelling between the discharge port and the suction port there is substantial clearancebetween their end faces and the cover late, which clearance is controlled, however, by the front and rear bearing contact of the idler teeth in closure against short circuit slippage between the ports.

. claim as my invention:

1. A device of the character described comprising a casing having a cylindrical chamber with a suction port and a discharge port, a rotor in said chamber having a concentric series of laterally extendin s aced teeth operatively adjacent the cy in rical Wall of said chamber, a rotatably mounted idler positioned within said series of rotor teeth 1n eccentric relation thereto, said idler having radial teeth enga 'ng said series of rotor teeth between sai ports, said idler teeth being of greater width than the lateral length of said rotor teeth, a stationary'crescentic member occupying the space between the paths of movement of said idler teeth and said rotor teeth in their disengaged relation, and an end closure for said chamber, said end closure having that portion of its inner face opposed to said idler and between said ports in a plane with the adjacent side of said idler, and having that portion' of its inner face opposed to the path of movement of said rotor teeth when out of engagement with said idler in a plane with the adjacent ends of said rotor teeth.

2. A device` of the character described comprising a casing having a cylindrical chamber with a suction port and a discharge port, a rotor in said chamber having a concentric series of laterallyextending s aced teeth operatively adjacent the cylin rical wall of said chamber, a rotatably mounted idler positioned within said series of rotor teeth in eccentric relation thereto, said idler having radial teeth engaging said series of ioo los

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rotor teeth between said orts, said idler teeth extending outward o the lateral ends of said rotor teeth,l a stationary crescentic member occupying the space between the paths of movement of said idler teeth and said rotor teeth in their disengaged relation, and an end closure for said chamber, said end closure having that portion of its inner face within said crescentic member and between said orts in a plane with the adjacent side of* sai idler, and having that portion of its inner face outward ofsaid'crescentic member and saidports in ai plane with the adjacent ends of said rotor teeth.

3. In a rotary pum having a laterally toothed rotor and a ra ially toothed idler in inner eccentric engagement therewith, the

formation' of said id er teeth with greater width than the lateral length of said rotor teeth, and a' plate laterali adjacent said idler and said rotor, said p ate having that portion of its face opposed to said idler and the intersecting portion of the path of moveof movement of sai rotor teeth in a p ane with the adjacent ends of said rotor teeth. 4. In a rotarypump, havin a rotor with an annular series of latera ly extending teeth and an idler with radial teeth in inner eccentric engagement with said rotor teeth,

` the arrangement of said idler teeth with their outer lateral faces in a plane outward of the end ,faces of said rotor teeth, and a late laterally adjacent said rotor and said idler, said late being in operative bearing contact wit the lateral faces of said idler teeth and also in o rative\bearing contact with the lateral en s ofsaid rotor teeth in that portion of the path of movement of said rotorteeth not intercepted by movement of said idler teeth.

In witness whereof I have hereunto attached my signature.

" LEONARD F. HEITZ.

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